Injections in which relatively cool water can hit hot surfaces should be fitted with a protective shirt. Otherwise, thermal shock or fatigue cracks can quickly occur due to temperature-related tensions on the inner pipe surface and erosion due to superficial evaporation of the water. Sooner or later, this damage will cause the steam pipe to fail. This damage is safely prevented by a protective pipe integrated into the pressure-carrying steam pipe. The design of TEC artec's TecMix allows the protective tube to move almost tension-free within the steam pipe and thus completely avoids further damage, such as cracks on welds, material breakouts, etc.